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本文研究了有限长度含有单一粗糙面的垂直走滑断层的滑动弱化不稳定性。我们假定断层强度在其深度方向是均匀的,而在走滑方向是不均匀的,即存在一个高强度段.并假定断层上的粗糙段及断层上的其它部分具有相同类型的本构律,只是峰值应力不同.断层周围的地壳材料用上、下表面应力自由的弹性平板来模拟.我们用有限元方法研究了理论位移场、应力场和应变场随远场位移的演变情况.此时,断层位移和摩擦应力并不是预先给定的,而是在求解过程中同时确定的.根据计算结果,我们比较了理论位移场及断层上摩擦应力分布在稳定和不稳定滑动情况时的差别.并与内部含有低强度段的走滑断层的场合做了比较.
In this paper, we study the sliding weakening instability of a vertical strike-slip fault with a finite length containing a single rough surface. We assume that the fault strength is uniform in the depth direction and non-uniform in the strike-slip direction, that is, there is a high-strength segment, and it is assumed that the rough segment on the fault and other parts of the fault have the same type of constitutive law, Only the peak stress is different.The crustal material around the fault is modeled by the elastic plate whose stress is free on the upper and lower surfaces.We study the evolution of theoretical displacement field, stress field and strain field with the far-field displacement by finite element method, The fault displacement and the frictional stress are not given in advance, but are determined simultaneously in the solution process.According to the calculation results, we compare the theoretical displacement field and the difference of the friction stress distribution on the fault between steady and unstable slip cases. Compared with the case of strike-slip faults with low-intensity segments in-house.